Building a cheap gaming PC

Hey again,
I know this is my second post in a short while, but after the advice I got earlier I spoke to my more tech savvy friend about maybe building my own PC, and he said he wouldn't mind lending me a hand. So I've gotten together a list of what I'd like but I'm afraid he's unreachable now for a few days, so I've decided to return to this forum for help.

Here are the specs I've come up with and I'm wondering if it should all work:

Unless you are going to be over-clocking your CPU then I would drop the freezer pro and use the extra to upgrade you GPU from the 6850 to the 6870.If you are going to be gaming online then you would do better to be connected to the internet via Ethernet cable as opposed to wireless.

Do not forget a tube of thermal paste, as for cables they will all come with your motherboard,(Sata Cables), your case/PSU should come with the power cable. Obviously you will need to connect your monitor to your graphics card so you will need,depending on your monitor connections either a HDMI cable or a DVI cable or a DVI to VGA adapter cable.

Yeah I looked into the suggestions and spoke with my friend, who advised me to find out how much the parts I wanted would cost me seperately, it turns out it saves me about £100, so thank you for all your help :)

Also, my PC is placed on the other side of the house from our router, and because of the way the house was built, moving the router from that location is impossible. I find that gaming on my Xbox wirelessly is no trouble, but will that be different for my PC? Would it make more sense to find a way to connect via ethernet? If so could you suggest how I'd do that?

If it works on with the Xbox then leave things as they are. If you are having problems later we can have a look at your options. My PC is about three rooms away from the router, which is directly connected to the main telephone socket, and my PC is connected, along with two printers and a NAS box,via Ethernet cable and hub. No problems at all.